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Eric Paroissien - One of the best experts on this subject based on the ideXlab platform.
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Simplified Stress analysis of multilayered bonded structure under 1D-bar kinematics
Composite Structures, 2020Co-Authors: Vincent Torrelli, Eric ParoissienAbstract:Many current materials and structural systems are layered. The structural performances of these multilayered systems are dependent on interfaces, the presence of which is inherent to them. A methodology for the simplified Stress analysis of such structures under 1D-bar kinematics is presented. The macro-element technique is used to solve the set of ordinary differential equations involved. A dedicated macro-element is formulated through the approximation of displacements fields by Taylor expansion power series. The predictions of the simplified Stress analysis are in close agreements with those obtained by FE analyses. Finally, the influence of Adhesive thickness and of the overlap length on the Adhesive Stress peaks is presented.
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Simplified Stress analysis of multilayered Adhesively bonded structures
International Journal of Adhesion and Adhesives, 2020Co-Authors: Kübra Sekmen, Eric Paroissien, Frederic LachaudAbstract:Bolting technologies have been commonly used to assemble structural members in order to carry loads. However, the main drawback of these joints is the local reduction of the strength-to-Stress ratio. Compared to the bolted joints, Adhesive bonding technology allows for the increase of static and fatigue strength while reducing the weight. The Finite Element (FE) method is able to address the Stress analysis of bonded joints. Nevertheless, analyses based on FE models are computationally expensive. Therefore, it is profitable to develop new simplified approaches enabling extensive parametric studies. A semi-analytical technique was developed to model the joints based on the formulation of 4-node special elements, termed macro-elements, which is able to simulate an entire bonded overlap at low computational costs. In this paper, a multilayered bonded-bars and a multilayered bonded-beams macro-elements are derived from bonded-bar and bonded-beam macro-elements. 1D-bar and 1D-beam simplified Stress analyses of such multilayered joints are presented in order to predict the Adhesive Stress distributions along the overlap. For validation purpose, the results obtained by the simplified 1D-bar and 1D-beam model are compared with the results predicted by 1D-FE models. Good agreements are shown. Finally, the parametric studies are performed in order to understand the mechanical behavior of multilayered Adhesively bonded structures. This presented simplified Stress analysis can be used to deduce the sizing guidelines as a consequence of these parametric studies.
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Simplified Stress analysis of functionally graded single-lap joints subjected to combined thermal and mechanical loads
Composite Structures, 2018Co-Authors: Eric Paroissien, Lucas F M Da Silva, Frederic LachaudAbstract:– Functionally graded Adhesive (FGA) joints involve a continuous variation of the Adhesive properties along the overlap allowing for the homogenization of the Stress distribution and load transfer, in order to increase the joint strength. The use of FGA joints made of dissimilar adherends under combined mechanical and thermal loads could then be an attractive solution. This paper aims at presenting a 1D-bar and a 1D-beam simplified Stress analyses of such multimaterial joints, in order to predict the Adhesive Stress distribution along the overlap, as a function of the Adhesive graduation. The graduation of the Adhesive properties leads to differential equations which coefficients can vary the overlap length. For the 1D-bar analyses, two different resolution schemes are employed. The first one makes use of Taylor expansion power series (TEPS) as already published under pure mechanical load. The second one is based on the macro-element (ME) technique. For the 1D-beam analysis, the solution is only based on the ME technique. A comparative study against balanced and
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Simplified Stress analysis of functionally graded single-lap joints subjected to combined thermal and mechanical loads
Composite Structures, 2018Co-Authors: Eric Paroissien, Lucas F M Da Silva, Frederic LachaudAbstract:– Functionally graded Adhesive (FGA) joints involve a continuous variation of the Adhesive properties along the overlap allowing for the homogenization of the Stress distribution and load transfer, in order to increase the joint strength. The use of FGA joints made of dissimilar adherends under combined mechanical and thermal loads could then be an attractive solution. This paper aims at presenting a 1D-bar and a 1D-beam simplified Stress analyses of such multimaterial joints, in order to predict the Adhesive Stress distribution along the overlap, as a function of the Adhesive graduation. The graduation of the Adhesive properties leads to differential equations which coefficients can vary the overlap length. For the 1D-bar analyses, two different resolution schemes are employed. The first one makes use of Taylor expansion power series (TEPS) as already published under pure mechanical load. The second one is based on the macro-element (ME) technique. For the 1D-beam analysis, the solution is only based on the ME technique. A comparative study against balanced and
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simplified Stress analysis of functionally graded single lap joints subjected to combined thermal and mechanical loads
Composite Structures, 2018Co-Authors: Eric Paroissien, Lucas F M Da Silva, Frederic LachaudAbstract:Abstract Functionally graded Adhesive (FGA) joints involve a continuous variation of the Adhesive properties along the overlap allowing for the homogenization of the Stress distribution and load transfer, in order to increase the joint strength. The use of FGA joints made of dissimilar adherends under combined mechanical and thermal loads could then be an attractive solution. This paper aims at presenting a 1D-bar and a 1D-beam simplified Stress analyses of such multimaterial joints, in order to predict the Adhesive Stress distribution along the overlap, as a function of the Adhesive graduation. The graduation of the Adhesive properties leads to differential equations which coefficients can vary the overlap length. For the 1D-bar analyses, two different resolution schemes are employed. The first one makes use of Taylor expansion power series (TEPS) as already published under pure mechanical load. The second one is based on the macro-element (ME) technique. For the 1D-beam analysis, the solution is only based on the ME technique. A comparative study against balanced and unbalanced joint configurations under pure mechanical and/or thermal loads involving constant or graduated Adhesive properties are provided to assess the presented Stress analyses. The mathematical description of the analyses is provided.
Frederic Lachaud - One of the best experts on this subject based on the ideXlab platform.
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Simplified Stress analysis of multilayered Adhesively bonded structures
International Journal of Adhesion and Adhesives, 2020Co-Authors: Kübra Sekmen, Eric Paroissien, Frederic LachaudAbstract:Bolting technologies have been commonly used to assemble structural members in order to carry loads. However, the main drawback of these joints is the local reduction of the strength-to-Stress ratio. Compared to the bolted joints, Adhesive bonding technology allows for the increase of static and fatigue strength while reducing the weight. The Finite Element (FE) method is able to address the Stress analysis of bonded joints. Nevertheless, analyses based on FE models are computationally expensive. Therefore, it is profitable to develop new simplified approaches enabling extensive parametric studies. A semi-analytical technique was developed to model the joints based on the formulation of 4-node special elements, termed macro-elements, which is able to simulate an entire bonded overlap at low computational costs. In this paper, a multilayered bonded-bars and a multilayered bonded-beams macro-elements are derived from bonded-bar and bonded-beam macro-elements. 1D-bar and 1D-beam simplified Stress analyses of such multilayered joints are presented in order to predict the Adhesive Stress distributions along the overlap. For validation purpose, the results obtained by the simplified 1D-bar and 1D-beam model are compared with the results predicted by 1D-FE models. Good agreements are shown. Finally, the parametric studies are performed in order to understand the mechanical behavior of multilayered Adhesively bonded structures. This presented simplified Stress analysis can be used to deduce the sizing guidelines as a consequence of these parametric studies.
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Simplified Stress analysis of functionally graded single-lap joints subjected to combined thermal and mechanical loads
Composite Structures, 2018Co-Authors: Eric Paroissien, Lucas F M Da Silva, Frederic LachaudAbstract:– Functionally graded Adhesive (FGA) joints involve a continuous variation of the Adhesive properties along the overlap allowing for the homogenization of the Stress distribution and load transfer, in order to increase the joint strength. The use of FGA joints made of dissimilar adherends under combined mechanical and thermal loads could then be an attractive solution. This paper aims at presenting a 1D-bar and a 1D-beam simplified Stress analyses of such multimaterial joints, in order to predict the Adhesive Stress distribution along the overlap, as a function of the Adhesive graduation. The graduation of the Adhesive properties leads to differential equations which coefficients can vary the overlap length. For the 1D-bar analyses, two different resolution schemes are employed. The first one makes use of Taylor expansion power series (TEPS) as already published under pure mechanical load. The second one is based on the macro-element (ME) technique. For the 1D-beam analysis, the solution is only based on the ME technique. A comparative study against balanced and
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Simplified Stress analysis of functionally graded single-lap joints subjected to combined thermal and mechanical loads
Composite Structures, 2018Co-Authors: Eric Paroissien, Lucas F M Da Silva, Frederic LachaudAbstract:– Functionally graded Adhesive (FGA) joints involve a continuous variation of the Adhesive properties along the overlap allowing for the homogenization of the Stress distribution and load transfer, in order to increase the joint strength. The use of FGA joints made of dissimilar adherends under combined mechanical and thermal loads could then be an attractive solution. This paper aims at presenting a 1D-bar and a 1D-beam simplified Stress analyses of such multimaterial joints, in order to predict the Adhesive Stress distribution along the overlap, as a function of the Adhesive graduation. The graduation of the Adhesive properties leads to differential equations which coefficients can vary the overlap length. For the 1D-bar analyses, two different resolution schemes are employed. The first one makes use of Taylor expansion power series (TEPS) as already published under pure mechanical load. The second one is based on the macro-element (ME) technique. For the 1D-beam analysis, the solution is only based on the ME technique. A comparative study against balanced and
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simplified Stress analysis of functionally graded single lap joints subjected to combined thermal and mechanical loads
Composite Structures, 2018Co-Authors: Eric Paroissien, Lucas F M Da Silva, Frederic LachaudAbstract:Abstract Functionally graded Adhesive (FGA) joints involve a continuous variation of the Adhesive properties along the overlap allowing for the homogenization of the Stress distribution and load transfer, in order to increase the joint strength. The use of FGA joints made of dissimilar adherends under combined mechanical and thermal loads could then be an attractive solution. This paper aims at presenting a 1D-bar and a 1D-beam simplified Stress analyses of such multimaterial joints, in order to predict the Adhesive Stress distribution along the overlap, as a function of the Adhesive graduation. The graduation of the Adhesive properties leads to differential equations which coefficients can vary the overlap length. For the 1D-bar analyses, two different resolution schemes are employed. The first one makes use of Taylor expansion power series (TEPS) as already published under pure mechanical load. The second one is based on the macro-element (ME) technique. For the 1D-beam analysis, the solution is only based on the ME technique. A comparative study against balanced and unbalanced joint configurations under pure mechanical and/or thermal loads involving constant or graduated Adhesive properties are provided to assess the presented Stress analyses. The mathematical description of the analyses is provided.
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An extended semi-analytical formulation for fast and reliable mode I/II Stress analysis of Adhesively bonded joints
International Journal of Solids and Structures, 2015Co-Authors: Guillaume Lélias, Eric Paroissien, Frederic Lachaud, Joseph Morlier, Sébastien Schwartz, Cyril GavoilleAbstract:The Finite Element (FE) method is able to address the Stress analysis of Adhesively bonded joints. However, analyses based on FE models are computationally expansive and it would be profitable to develop simplified approaches enabling extensive parametric studies. Firstly, a 1D-beam simplified model for the bonded joint Stress analysis assuming a linear elastic Adhesive material is presented. This model, derived from an approach inspired by the Finite Element (FE) method and based on the semi-analytical formulation of a 4-nodes macro-element, is able to simulate entire bonded overlaps at low computational costs. Secondly, a numerical procedure allowing for non-linear Adhesive Stress–strain relationships to be accounted for is presented. This procedure allows for various non-linear Adhesive behaviors (ie. softening, plastic, etc.) to be accounted for with no restriction on the specimen geometry. The possible mixed-mode I/II response of the Adhesive layer is introduced through an extension of the classical Cohesive Zone Modeling (CZM) procedure. The aforementioned procedure is then illustrated using a bi-linear softening Adhesive behavior. However the procedure is not limited to this particular behavior only. The results obtained are finally compared to those of more time-consuming 2D FE strength predictions. Good agreement is shown.
Chihdar Charles Yang - One of the best experts on this subject based on the ideXlab platform.
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Stress model and strain energy release rate of a prescribed crack in scarf joint repair of composite panels
Journal of Composite Materials, 2015Co-Authors: Chihdar Charles Yang, John Tomblin, Lamia SalahAbstract:An analytical model for Stress distribution was derived and an analytical model for determining the strain energy release rate of a prescribed crack in a scarf joint or a bonded scarf repair of a composite panel was developed. The crack closure method was used to calculate the strain energy release rate at the crack tip after a prescribed crack was inserted at high Adhesive Stress locations. In the Stress model, the first-order laminated plate theory was applied to the composite panels, including the following: (1) scarfed parent substrate and corresponding repair panel for a bonded scarf repair or (2) both adherend panels for a scarf joint, assuming a linear elastic Adhesive. The bondline was presumed to be thin, so the Adhesive Stresses were presumed to be uniform through the thickness. The coupled second-order differential equations obtained via kinematics and force equilibrium were solved semi-numerically using the symbolic computational tool Maple. Finite element analyses using the commercial softwar...
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Stress model and strain energy release rate of a prescribed crack in scarf joint/repair of composite panels
Journal of Composite Materials, 2015Co-Authors: Chihdar Charles Yang, John Tomblin, Lamia SalahAbstract:An analytical model for Stress distribution was derived and an analytical model for determining the strain energy release rate of a prescribed crack in a scarf joint or a bonded scarf repair of a composite panel was developed. The crack closure method was used to calculate the strain energy release rate at the crack tip after a prescribed crack was inserted at high Adhesive Stress locations. In the Stress model, the first-order laminated plate theory was applied to the composite panels, including the following: (1) scarfed parent substrate and corresponding repair panel for a bonded scarf repair or (2) both adherend panels for a scarf joint, assuming a linear elastic Adhesive. The bondline was presumed to be thin, so the Adhesive Stresses were presumed to be uniform through the thickness. The coupled second-order differential equations obtained via kinematics and force equilibrium were solved semi-numerically using the symbolic computational tool Maple. Finite element analyses using the commercial softwar...
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Strain energy release rate determination of prescribed cracks in Adhesively-bonded single-lap composite joints with thick bondlines
Composites Part B-engineering, 2008Co-Authors: Chihdar Charles Yang, Alireza Chadegani, John TomblinAbstract:An analytical model for determining the strain energy release rate due to a prescribed crack in an Adhesively-bonded, single-lap composite joint with thick bondlines and subjected to axial tension is presented. An existing analytical model for determining the Adhesive Stresses within the joint is used as the foundation for the strain energy release rate calculation. In the Stress model, the governing equations of displacements within the adherends are formulated using the first-order laminated plate theory. In order to simulate the thick bondlines, the field equations of the Adhesive are formulated using the linear elastic theory to allow non-uniform Stress distributions through the thickness. Based on the Adhesive Stress distributions, the equivalent crack tip forces are obtained and the strain energy release rate due to the crack extension is determined by using the virtual crack closure technique (VCCT). The specimen geometry of ASTM D3165 standard test is followed in the derivation. The system of second-order differential equations is solved to provide the adherend and Adhesive Stresses using the symbolic computational tool, Maple 7. Finite element analyses using J-integral as well as VCCT are performed to verify the developed analytical model. Finite element analyses are conducted using the commercial finite element analysis software ABAQUS™. The strain energy release rates determined using the analytical method correlate well with the results from the finite element analyses. It can be seen that the same prescribed crack has a higher strain energy release rate for the joints with thicker bondlines. This explains the reason that joints with thick bondlines tend to have a lower load carrying capacity.
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Elastic-Plastic Model of Adhesive-Bonded Single-Lap Composite Joints
Journal of Composite Materials, 2004Co-Authors: Chihdar Charles Yang, John Tomblin, Hai Huang, Wenjun SunAbstract:An analytical model for determining Adhesive Stress distributions within the Adhesive-bonded single-lap composite joints was developed. ASTM D3165 ‘‘Strength Properties of Adhesives in Shear by Tension Loading of Single-Lap-Joint Laminated Assemblies’’ test specimen geometry was followed in the model derivation. In the model derivation, the composite adherends were assumed linear elastic while the Adhesive was assumed elastic-perfectly plastic following von Mises yield criterion. Laminated Anisotropic Plate Theory was applied in the derivation of the governing equations of the bonded laminates. The Adhesive was assumed to be very thin and the Adhesive Stresses are assumed constant through the bondline thickness. The entire coupled system of equations was determined through the kinematics relations and force equilibrium of the Adhesive and the adherends. The overall system of governing equations was solved analytically with appropriate boundary conditions. Computer software Maple V was used as the solution...
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Stress-strain analysis of Adhesive-bonded single-lap composite joints under cylindrical bending
Composites Engineering, 1993Co-Authors: Chihdar Charles Yang, Su-seng PangAbstract:Abstract An analytical study is proposed to develop an advanced model for determining the Stress and strain distributions of Adhesive-bonded composite single-lap joints under cylindrical bending. The anisotropic laminated plate theory and mechanics of composite materials are first used to derive the governing equations of the two bonded laminates. The entire coupled system is then obtained through assuming the peel Stress between the two laminates. With the Fourier series and appropriate boundary conditions, the solutions of the system are obtained. Based on the proposed model, the Stress and strain distributions of the adherends and the Adhesive can be predicted. The coupling effects between tension and bending for asymmetric laminates are also included in this analysis. With the predicted Stress distribution, the maximum peel and shear Stresses, which are believed to be the most critical criteria on the joint strength, can be located and their values can be determined. An existing FEA code, “ALGOR”, is used as a comparison with this proposed analytical model. Based on the proposed analytical model, the maximum Adhesive Stress for different overlay lengths is predicted. An optimal overlay length is found to minimize the Adhesive Stress at the ends of the overlay. This study will be of interest to the aircraft industry since many advanced composite materials and Adhesive-bonded lap joints are widely used in this field.
John Tomblin - One of the best experts on this subject based on the ideXlab platform.
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Stress model and strain energy release rate of a prescribed crack in scarf joint repair of composite panels
Journal of Composite Materials, 2015Co-Authors: Chihdar Charles Yang, John Tomblin, Lamia SalahAbstract:An analytical model for Stress distribution was derived and an analytical model for determining the strain energy release rate of a prescribed crack in a scarf joint or a bonded scarf repair of a composite panel was developed. The crack closure method was used to calculate the strain energy release rate at the crack tip after a prescribed crack was inserted at high Adhesive Stress locations. In the Stress model, the first-order laminated plate theory was applied to the composite panels, including the following: (1) scarfed parent substrate and corresponding repair panel for a bonded scarf repair or (2) both adherend panels for a scarf joint, assuming a linear elastic Adhesive. The bondline was presumed to be thin, so the Adhesive Stresses were presumed to be uniform through the thickness. The coupled second-order differential equations obtained via kinematics and force equilibrium were solved semi-numerically using the symbolic computational tool Maple. Finite element analyses using the commercial softwar...
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Stress model and strain energy release rate of a prescribed crack in scarf joint/repair of composite panels
Journal of Composite Materials, 2015Co-Authors: Chihdar Charles Yang, John Tomblin, Lamia SalahAbstract:An analytical model for Stress distribution was derived and an analytical model for determining the strain energy release rate of a prescribed crack in a scarf joint or a bonded scarf repair of a composite panel was developed. The crack closure method was used to calculate the strain energy release rate at the crack tip after a prescribed crack was inserted at high Adhesive Stress locations. In the Stress model, the first-order laminated plate theory was applied to the composite panels, including the following: (1) scarfed parent substrate and corresponding repair panel for a bonded scarf repair or (2) both adherend panels for a scarf joint, assuming a linear elastic Adhesive. The bondline was presumed to be thin, so the Adhesive Stresses were presumed to be uniform through the thickness. The coupled second-order differential equations obtained via kinematics and force equilibrium were solved semi-numerically using the symbolic computational tool Maple. Finite element analyses using the commercial softwar...
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Strain energy release rate determination of prescribed cracks in Adhesively-bonded single-lap composite joints with thick bondlines
Composites Part B-engineering, 2008Co-Authors: Chihdar Charles Yang, Alireza Chadegani, John TomblinAbstract:An analytical model for determining the strain energy release rate due to a prescribed crack in an Adhesively-bonded, single-lap composite joint with thick bondlines and subjected to axial tension is presented. An existing analytical model for determining the Adhesive Stresses within the joint is used as the foundation for the strain energy release rate calculation. In the Stress model, the governing equations of displacements within the adherends are formulated using the first-order laminated plate theory. In order to simulate the thick bondlines, the field equations of the Adhesive are formulated using the linear elastic theory to allow non-uniform Stress distributions through the thickness. Based on the Adhesive Stress distributions, the equivalent crack tip forces are obtained and the strain energy release rate due to the crack extension is determined by using the virtual crack closure technique (VCCT). The specimen geometry of ASTM D3165 standard test is followed in the derivation. The system of second-order differential equations is solved to provide the adherend and Adhesive Stresses using the symbolic computational tool, Maple 7. Finite element analyses using J-integral as well as VCCT are performed to verify the developed analytical model. Finite element analyses are conducted using the commercial finite element analysis software ABAQUS™. The strain energy release rates determined using the analytical method correlate well with the results from the finite element analyses. It can be seen that the same prescribed crack has a higher strain energy release rate for the joints with thicker bondlines. This explains the reason that joints with thick bondlines tend to have a lower load carrying capacity.
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Elastic-Plastic Model of Adhesive-Bonded Single-Lap Composite Joints
Journal of Composite Materials, 2004Co-Authors: Chihdar Charles Yang, John Tomblin, Hai Huang, Wenjun SunAbstract:An analytical model for determining Adhesive Stress distributions within the Adhesive-bonded single-lap composite joints was developed. ASTM D3165 ‘‘Strength Properties of Adhesives in Shear by Tension Loading of Single-Lap-Joint Laminated Assemblies’’ test specimen geometry was followed in the model derivation. In the model derivation, the composite adherends were assumed linear elastic while the Adhesive was assumed elastic-perfectly plastic following von Mises yield criterion. Laminated Anisotropic Plate Theory was applied in the derivation of the governing equations of the bonded laminates. The Adhesive was assumed to be very thin and the Adhesive Stresses are assumed constant through the bondline thickness. The entire coupled system of equations was determined through the kinematics relations and force equilibrium of the Adhesive and the adherends. The overall system of governing equations was solved analytically with appropriate boundary conditions. Computer software Maple V was used as the solution...
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Analytical Modeling of ASTM Lap Shear Adhesive Specimens
2003Co-Authors: Charles Yang, John Tomblin, Zhidong GuanAbstract:Abstract : Advanced composite materials have been widely used in the aviation industry due to their lightweight and high-corrosion resistance. While the aviation industry increasingly uses Adhesive bond for airframe composite structures, two issues have become particularly important: certification of Adhesives used and certification of Adhesive joints. A generally agreed-upon design methodology for Adhesive-bonded composite joints, especially the failure criterion, is lacking. Typically, three failure modes of Adhesive-bonded composite joints exist: (1) adherend failure, (2) Adhesive failure (failure at the Adhesive/adherend interface), and (3) cohesive failure (failure within the Adhesive layer). A previous report (DOT/FAA/AR-0l/57, 2001) included an analytical model development for adherend failure mode. This report describes the investigation of Adhesive and cohesive failure modes. The first part presents the derivation of an analytical model for predicting Adhesive Stress distribution within the joint specimens of ASTM D 3165. Elastic orthotropic adherends and elastic-perfectly plastic Adhesive were used in the model development. The developed Stress model was verified with finite element models by comparing the Adhesive Stress distributions. Failure analysis was conducted based on three failure criteria. Predicted strengths were compared with test data. The second part of the report contains finite element approaches for analyzing Adhesive and cohesive failure modes. The equivalent plastic strain and J-integral were used as the failure criteria for cohesive and Adhesive failure modes, respectively. Experimental data were used to establish the values of the equivalent plastic strain and the critical value of J-integral. (12 tables, 62 figures, 27 refs.)
Lucas F M Da Silva - One of the best experts on this subject based on the ideXlab platform.
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Simplified Stress analysis of functionally graded single-lap joints subjected to combined thermal and mechanical loads
Composite Structures, 2018Co-Authors: Eric Paroissien, Lucas F M Da Silva, Frederic LachaudAbstract:– Functionally graded Adhesive (FGA) joints involve a continuous variation of the Adhesive properties along the overlap allowing for the homogenization of the Stress distribution and load transfer, in order to increase the joint strength. The use of FGA joints made of dissimilar adherends under combined mechanical and thermal loads could then be an attractive solution. This paper aims at presenting a 1D-bar and a 1D-beam simplified Stress analyses of such multimaterial joints, in order to predict the Adhesive Stress distribution along the overlap, as a function of the Adhesive graduation. The graduation of the Adhesive properties leads to differential equations which coefficients can vary the overlap length. For the 1D-bar analyses, two different resolution schemes are employed. The first one makes use of Taylor expansion power series (TEPS) as already published under pure mechanical load. The second one is based on the macro-element (ME) technique. For the 1D-beam analysis, the solution is only based on the ME technique. A comparative study against balanced and
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Simplified Stress analysis of functionally graded single-lap joints subjected to combined thermal and mechanical loads
Composite Structures, 2018Co-Authors: Eric Paroissien, Lucas F M Da Silva, Frederic LachaudAbstract:– Functionally graded Adhesive (FGA) joints involve a continuous variation of the Adhesive properties along the overlap allowing for the homogenization of the Stress distribution and load transfer, in order to increase the joint strength. The use of FGA joints made of dissimilar adherends under combined mechanical and thermal loads could then be an attractive solution. This paper aims at presenting a 1D-bar and a 1D-beam simplified Stress analyses of such multimaterial joints, in order to predict the Adhesive Stress distribution along the overlap, as a function of the Adhesive graduation. The graduation of the Adhesive properties leads to differential equations which coefficients can vary the overlap length. For the 1D-bar analyses, two different resolution schemes are employed. The first one makes use of Taylor expansion power series (TEPS) as already published under pure mechanical load. The second one is based on the macro-element (ME) technique. For the 1D-beam analysis, the solution is only based on the ME technique. A comparative study against balanced and
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simplified Stress analysis of functionally graded single lap joints subjected to combined thermal and mechanical loads
Composite Structures, 2018Co-Authors: Eric Paroissien, Lucas F M Da Silva, Frederic LachaudAbstract:Abstract Functionally graded Adhesive (FGA) joints involve a continuous variation of the Adhesive properties along the overlap allowing for the homogenization of the Stress distribution and load transfer, in order to increase the joint strength. The use of FGA joints made of dissimilar adherends under combined mechanical and thermal loads could then be an attractive solution. This paper aims at presenting a 1D-bar and a 1D-beam simplified Stress analyses of such multimaterial joints, in order to predict the Adhesive Stress distribution along the overlap, as a function of the Adhesive graduation. The graduation of the Adhesive properties leads to differential equations which coefficients can vary the overlap length. For the 1D-bar analyses, two different resolution schemes are employed. The first one makes use of Taylor expansion power series (TEPS) as already published under pure mechanical load. The second one is based on the macro-element (ME) technique. For the 1D-beam analysis, the solution is only based on the ME technique. A comparative study against balanced and unbalanced joint configurations under pure mechanical and/or thermal loads involving constant or graduated Adhesive properties are provided to assess the presented Stress analyses. The mathematical description of the analyses is provided.
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single lap joints loaded in tension with high strength steel adherends
International Journal of Adhesion and Adhesives, 2013Co-Authors: E F Karachalios, Robert D. Adams, Lucas F M Da SilvaAbstract:Abstract Single lap joints in many different geometric and material configurations were analysed using finite element analysis and tested in tension. Geometric parameters, such as the overlap length and adherend thickness, together with material parameters such as the adherend and Adhesive Stress–strain behaviour, were all tested. The mechanisms and modes of failure were observed for different cases, and positions of damage initiation were identified. Failure patterns were related to failure mechanisms. A failure prediction methodology has been proposed and a good correlation was obtained between the experimental and finite element predictions of strength for a variety of joint configurations. The study is presented in two parts. In the first (present paper), high strength steel adherends are considered and in the second paper ductile steel adherends are studied. For high strength steel adherends and a relatively short overlap, failure is dominated by Adhesive global yielding. As the overlap gets longer, however, failure is no longer due to global yielding, but due to high local shear strains.
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Single lap joints loaded in tension with ductile steel adherends
International Journal of Adhesion and Adhesives, 2013Co-Authors: E F Karachalios, Robert D. Adams, Lucas F M Da SilvaAbstract:Abstract In the first part of this study, single lap joints in many different geometric and material configurations were tested in tension with high strength steel adherends. In the present paper, low strength steel adherends (mild steel and medium carbon steel) have been studied experimentally and numerically. Geometric parameters such as the overlap length and the adherend thickness, together with material parameters such as the Adhesive Stress–strain behaviour, were all tested. The mechanisms and modes of failure were observed for different cases, and positions of damage initiation were identified. Contrarily to the joints with high strength steel, it is found that the failure mechanism in this case is dictated by adherend yielding.